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T-shirts that detect pollution, wind power from transit tunnels, and solar power in coal’s heartland… your green tech finds for the week.

The pollution-detecting t-shirt: NYU grad students Nien Lam and Sue Ngo’s Warning Signs t-shirts display either a heart or a pair of lungs that change color according to the levels of carbon monoxide in the air. Watch it work above… (via Green Energy News and @greeneconpost)